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Finding the Fourth Proportional to 328.46, 491.94 and 191.30

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Solution

The fourth proportional to 328.46, 491.94 and 191.30 is: 286.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.46 : 491.94 = 191.30 : x
  2. Step 2: Convert to fraction form
    328.46/491.94 = 191.30/x
  3. Step 3: Cross multiply
    328.46x = 491.94 × 191.30
  4. Step 4: Simplify right side
    328.46x = 94,105.66
  5. Step 5: Solve for x
    x = 94,105.66/328.46
  6. Step 6: Final answer
    x = 286.51

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.